如何在Spring Cloud Gateway中添加特定于路由的自定义过滤器

Question

所以我对spring cloud gateway是个新手，刚刚开始玩它。我在浏览文档时偶然发现了如何创建自定义过滤器。

https://cloud.spring.io/spring-cloud-gateway/reference/html/#developer-guide

这是我创建自定义过滤器的代码-

       @Component
      public class CustomPreFilterFactory extends AbstractGatewayFilterFactory<CustomPreFilterFactory.Config> {


      public static class Config {
        //Put the configuration properties for your filter here
      }

     @Override
     public GatewayFilter apply(Config config) {

       return (exchange,chain) ->{
        ServerHttpRequest.Builder builder = exchange.getRequest().mutate();
        System.out.println("Request came in custom pre filter");
        return chain.filter(exchange.mutate().request(builder.build()).build());
      };
    }
  }

        @Bean
      public RouteLocator myRoutes(RouteLocatorBuilder routeLocatorBuilder) 
{
      return routeLocatorBuilder.routes()
         .route( p -> p.path("/hello").uri("http://localhost:8081"))
        .build();
}

  1. https://www.javainuse.com/spring/cloud-filter
  2. https://medium.com/@niral22/spring-cloud-gateway-tutorial-5311ddd59816

它们都使用属性而不是使用路由api创建路由。

任何帮助都是非常感谢的。

Answer 1

这个解决方案对我很有效，我创建了一个OrderedGatewayFilter，使用注入的CustomGatewayFilterFactory创建了一个OrderedGatewayFilter，并将该过滤器添加到路由中：

@Bean
public RouteLocator myRoutes(RouteLocatorBuilder routeLocatorBuilder, CustomGatewayFilterFactory customGatewayFilterFactory) 
{
    OrderedGatewayFilter orderedGatewayFilter =
      new OrderedGatewayFilter(customGatewayFilterFactory.apply(config), 45);
    return routeLocatorBuilder.routes()
         .route( p -> p.path("/hello").uri("http://localhost:8081").filter(orderedGatewayFilter))
        .build();
}